/*
 * Copyright 2009-2012 Evun Technology. 
 * 
 * This software is the confidential and proprietary information of
 * Evun Technology. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with evun.cn.
 */
package com.utils;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;

/**
 *
 *
 * @author  wei
 * @created 2012-12-20 上午11:10:34
 * @since   v1.3.1
 */
@SuppressWarnings({"rawtypes","unchecked"})
public class IOUtils {

	/**
	* The default buffer size to use.
	*/
	private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

	/**
	 * Unconditionally close a <code>Writer</code>.
	 * <p>
	 * Equivalent to {@link Writer#close()}, except any exceptions will be ignored.
	 * This is typically used in finally blocks.
	 *
	 * @param output  the Writer to close, may be null or already closed
	 */
	public static void closeQuietly(Writer output) {
		try {
			if (output != null) {
				output.close();
			}
		} catch (IOException ioe) {
			// ignore
		}
	}

	/**
	 * Unconditionally close an <code>InputStream</code>.
	 * <p>
	 * Equivalent to {@link InputStream#close()}, except any exceptions will be ignored.
	 * This is typically used in finally blocks.
	 *
	 * @param input  the InputStream to close, may be null or already closed
	 */
	public static void closeQuietly(InputStream input) {
		try {
			if (input != null) {
				input.close();
			}
		} catch (IOException ioe) {
			// ignore
		}
	}

	/**
	 * Unconditionally close an <code>OutputStream</code>.
	 * <p>
	 * Equivalent to {@link OutputStream#close()}, except any exceptions will be ignored.
	 * This is typically used in finally blocks.
	 *
	 * @param output  the OutputStream to close, may be null or already closed
	 */
	public static void closeQuietly(OutputStream output) {
		try {
			if (output != null) {
				output.close();
			}
		} catch (IOException ioe) {
			// ignore
		}
	}

	public static byte[] toByteArray(InputStream input) throws IOException {
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		copy(input, output);
		return output.toByteArray();
	}

	/**
	 * Get the contents of a <code>Reader</code> as a <code>byte[]</code>
	 * using the default character encoding of the platform.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 * 
	 * @param input  the <code>Reader</code> to read from
	 * @return the requested byte array
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 */
	public static byte[] toByteArray(Reader input) throws IOException {
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		copy(input, output);
		return output.toByteArray();
	}

	/**
	 * Copy bytes from an <code>InputStream</code> to chars on a
	 * <code>Writer</code> using the default character encoding of the platform.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 * <p>
	 * This method uses {@link InputStreamReader}.
	 *
	 * @param input  the <code>InputStream</code> to read from
	 * @param output  the <code>Writer</code> to write to
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void copy(InputStream input, Writer output) throws IOException {
		InputStreamReader in = new InputStreamReader(input,"UTF-8");
		copy(in, output);
	}

	/**
	 * Copy bytes from an <code>InputStream</code> to chars on a
	 * <code>Writer</code> using the specified character encoding.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * This method uses {@link InputStreamReader}.
	 *
	 * @param input  the <code>InputStream</code> to read from
	 * @param output  the <code>Writer</code> to write to
	 * @param encoding  the encoding to use, null means platform default
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void copy(InputStream input, Writer output, String encoding) throws IOException {
		if (encoding == null) {
			copy(input, output);
		} else {
			InputStreamReader in = new InputStreamReader(input, encoding);
			copy(in, output);
		}
	}

	// copy from Reader
	//-----------------------------------------------------------------------
	/**
	 * Copy chars from a <code>Reader</code> to a <code>Writer</code>.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 * <p>
	 * Large streams (over 2GB) will return a chars copied value of
	 * <code>-1</code> after the copy has completed since the correct
	 * number of chars cannot be returned as an int. For large streams
	 * use the <code>copyLarge(Reader, Writer)</code> method.
	 *
	 * @param input  the <code>Reader</code> to read from
	 * @param output  the <code>Writer</code> to write to
	 * @return the number of characters copied
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @throws ArithmeticException if the character count is too large
	 * @since Commons IO 1.1
	 */
	public static int copy(Reader input, Writer output) throws IOException {
		long count = copyLarge(input, output);
		if (count > Integer.MAX_VALUE) {
			return -1;
		}
		return (int) count;
	}

	/**
	 * Copy chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 *
	 * @param input  the <code>Reader</code> to read from
	 * @param output  the <code>Writer</code> to write to
	 * @return the number of characters copied
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.3
	 */
	public static long copyLarge(Reader input, Writer output) throws IOException {
		char[] buffer = new char[DEFAULT_BUFFER_SIZE];
		long count = 0;
		int n = 0;
		while (-1 != (n = input.read(buffer))) {
			output.write(buffer, 0, n);
			count += n;
		}
		return count;
	}

	/**
	 * Copy bytes from a large (over 2GB) <code>InputStream</code> to an
	 * <code>OutputStream</code>.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 * 
	 * @param input  the <code>InputStream</code> to read from
	 * @param output  the <code>OutputStream</code> to write to
	 * @return the number of bytes copied
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.3
	 */
	public static long copyLarge(InputStream input, OutputStream output) throws IOException {
		byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
		long count = 0;
		int n = 0;
		while (-1 != (n = input.read(buffer))) {
			output.write(buffer, 0, n);
			count += n;
		}
		return count;
	}

	/**
	 * Copy chars from a <code>Reader</code> to bytes on an
	 * <code>OutputStream</code> using the default character encoding of the
	 * platform, and calling flush.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 * <p>
	 * Due to the implementation of OutputStreamWriter, this method performs a
	 * flush.
	 * <p>
	 * This method uses {@link OutputStreamWriter}.
	 *
	 * @param input  the <code>Reader</code> to read from
	 * @param output  the <code>OutputStream</code> to write to
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void copy(Reader input, OutputStream output) throws IOException {
		OutputStreamWriter out = new OutputStreamWriter(output,"UTF-8");
		copy(input, out);
		// XXX Unless anyone is planning on rewriting OutputStreamWriter, we
		// have to flush here.
		out.flush();
	}

	/**
	 * Copy chars from a <code>Reader</code> to bytes on an
	 * <code>OutputStream</code> using the specified character encoding, and
	 * calling flush.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * Due to the implementation of OutputStreamWriter, this method performs a
	 * flush.
	 * <p>
	 * This method uses {@link OutputStreamWriter}.
	 *
	 * @param input  the <code>Reader</code> to read from
	 * @param output  the <code>OutputStream</code> to write to
	 * @param encoding  the encoding to use, null means platform default
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void copy(Reader input, OutputStream output, String encoding) throws IOException {
		if (encoding == null) {
			copy(input, output);
		} else {
			OutputStreamWriter out = new OutputStreamWriter(output, encoding);
			copy(input, out);
			// XXX Unless anyone is planning on rewriting OutputStreamWriter,
			// we have to flush here.
			out.flush();
		}
	}

	/**
	 * Get the contents of a <code>Reader</code> as a <code>byte[]</code>
	 * using the specified character encoding.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 * 
	 * @param input  the <code>Reader</code> to read from
	 * @param encoding  the encoding to use, null means platform default
	 * @return the requested byte array
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static byte[] toByteArray(Reader input, String encoding) throws IOException {
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		copy(input, output, encoding);
		return output.toByteArray();
	}

	// read toString
	//-----------------------------------------------------------------------
	/**
	 * Get the contents of an <code>InputStream</code> as a String
	 * using the default character encoding of the platform.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 * 
	 * @param input  the <code>InputStream</code> to read from
	 * @return the requested String
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 */
	public static String toString(InputStream input) throws IOException {
		StringWriter sw = new StringWriter();
		copy(input, sw);
		return sw.toString();
	}

	/**
	 * Get the contents of an <code>InputStream</code> as a String
	 * using the specified character encoding.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 * 
	 * @param input  the <code>InputStream</code> to read from
	 * @param encoding  the encoding to use, null means platform default
	 * @return the requested String
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 */
	public static String toString(InputStream input, String encoding) throws IOException {
		StringWriter sw = new StringWriter();
		copy(input, sw, encoding);
		return sw.toString();
	}

	/**
	 * Get the contents of a <code>Reader</code> as a String.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 * 
	 * @param input  the <code>Reader</code> to read from
	 * @return the requested String
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 */
	public static String toString(Reader input) throws IOException {
		StringWriter sw = new StringWriter();
		copy(input, sw);
		return sw.toString();
	}

	// copy from InputStream
	//-----------------------------------------------------------------------
	/**
	 * Copy bytes from an <code>InputStream</code> to an
	 * <code>OutputStream</code>.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 * <p>
	 * Large streams (over 2GB) will return a bytes copied value of
	 * <code>-1</code> after the copy has completed since the correct
	 * number of bytes cannot be returned as an int. For large streams
	 * use the <code>copyLarge(InputStream, OutputStream)</code> method.
	 * 
	 * @param input  the <code>InputStream</code> to read from
	 * @param output  the <code>OutputStream</code> to write to
	 * @return the number of bytes copied
	 * @throws NullPointerException if the input or output is null
	 * @throws IOException if an I/O error occurs
	 * @throws ArithmeticException if the byte count is too large
	 * @since Commons IO 1.1
	 */
	public static int copy(InputStream input, OutputStream output) throws IOException {
		long count = copyLarge(input, output);
		if (count > Integer.MAX_VALUE) {
			return -1;
		}
		return (int) count;
	}

	// readLines
	//-----------------------------------------------------------------------
	/**
	 * Get the contents of an <code>InputStream</code> as a list of Strings,
	 * one entry per line, using the default character encoding of the platform.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 *
	 * @param input  the <code>InputStream</code> to read from, not null
	 * @return the list of Strings, never null
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static List readLines(InputStream input) throws IOException {
		InputStreamReader reader = new InputStreamReader(input,"UTF-8");
		return readLines(reader);
	}

	/**
	 * Get the contents of an <code>InputStream</code> as a list of Strings,
	 * one entry per line, using the specified character encoding.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedInputStream</code>.
	 *
	 * @param input  the <code>InputStream</code> to read from, not null
	 * @param encoding  the encoding to use, null means platform default
	 * @return the list of Strings, never null
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static List readLines(InputStream input, String encoding) throws IOException {
		if (encoding == null) {
			return readLines(input);
		} else {
			InputStreamReader reader = new InputStreamReader(input, encoding);
			return readLines(reader);
		}
	}

	/**
	 * Get the contents of a <code>Reader</code> as a list of Strings,
	 * one entry per line.
	 * <p>
	 * This method buffers the input internally, so there is no need to use a
	 * <code>BufferedReader</code>.
	 *
	 * @param input  the <code>Reader</code> to read from, not null
	 * @return the list of Strings, never null
	 * @throws NullPointerException if the input is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static List readLines(Reader input) throws IOException {
		BufferedReader reader = new BufferedReader(input);
		List list = new ArrayList();
		String line = reader.readLine();
		while (line != null) {
			list.add(line);
			line = reader.readLine();
		}
		return list;
	}

	// write String
	//-----------------------------------------------------------------------
	/**
	 * Writes chars from a <code>String</code> to a <code>Writer</code>.
	 * 
	 * @param data  the <code>String</code> to write, null ignored
	 * @param output  the <code>Writer</code> to write to
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(String data, Writer output) throws IOException {
		if (data != null) {
			output.write(data);
		}
	}

	/**
	 * Writes chars from a <code>String</code> to bytes on an
	 * <code>OutputStream</code> using the default character encoding of the
	 * platform.
	 * <p>
	 * This method uses {@link String#getBytes()}.
	 * 
	 * @param data  the <code>String</code> to write, null ignored
	 * @param output  the <code>OutputStream</code> to write to
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(String data, OutputStream output) throws IOException {
		if (data != null) {
			output.write(data.getBytes("UTF-8"));
		}
	}

	/**
	 * Writes chars from a <code>String</code> to bytes on an
	 * <code>OutputStream</code> using the specified character encoding.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * This method uses {@link String#getBytes(String)}.
	 * 
	 * @param data  the <code>String</code> to write, null ignored
	 * @param output  the <code>OutputStream</code> to write to
	 * @param encoding  the encoding to use, null means platform default
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(String data, OutputStream output, String encoding) throws IOException {
		if (data != null) {
			if (encoding == null) {
				write(data, output);
			} else {
				output.write(data.getBytes(encoding));
			}
		}
	}

	// write StringBuffer
	//-----------------------------------------------------------------------
	/**
	 * Writes chars from a <code>StringBuffer</code> to a <code>Writer</code>.
	 * 
	 * @param data  the <code>StringBuffer</code> to write, null ignored
	 * @param output  the <code>Writer</code> to write to
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(StringBuffer data, Writer output) throws IOException {
		if (data != null) {
			output.write(data.toString());
		}
	}

	/**
	 * Writes chars from a <code>StringBuffer</code> to bytes on an
	 * <code>OutputStream</code> using the default character encoding of the
	 * platform.
	 * <p>
	 * This method uses {@link String#getBytes()}.
	 * 
	 * @param data  the <code>StringBuffer</code> to write, null ignored
	 * @param output  the <code>OutputStream</code> to write to
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(StringBuffer data, OutputStream output) throws IOException {
		if (data != null) {
			output.write(data.toString().getBytes("UTF-8"));
		}
	}

	/**
	 * Writes chars from a <code>StringBuffer</code> to bytes on an
	 * <code>OutputStream</code> using the specified character encoding.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * This method uses {@link String#getBytes(String)}.
	 * 
	 * @param data  the <code>StringBuffer</code> to write, null ignored
	 * @param output  the <code>OutputStream</code> to write to
	 * @param encoding  the encoding to use, null means platform default
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(StringBuffer data, OutputStream output, String encoding) throws IOException {
		if (data != null) {
			if (encoding == null) {
				write(data, output);
			} else {
				output.write(data.toString().getBytes(encoding));
			}
		}
	}

	// write byte[]
	//-----------------------------------------------------------------------
	/**
	 * Writes bytes from a <code>byte[]</code> to an <code>OutputStream</code>.
	 * 
	 * @param data  the byte array to write, do not modify during output,
	 * null ignored
	 * @param output  the <code>OutputStream</code> to write to
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(byte[] data, OutputStream output) throws IOException {
		if (data != null) {
			output.write(data);
		}
	}

	/**
	 * Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code>
	 * using the default character encoding of the platform.
	 * <p>
	 * This method uses {@link String#String(byte[])}.
	 * 
	 * @param data  the byte array to write, do not modify during output,
	 * null ignored
	 * @param output  the <code>Writer</code> to write to
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(byte[] data, Writer output) throws IOException {
		if (data != null) {
			output.write(new String(data,"UTF-8"));
		}
	}

	/**
	 * Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code>
	 * using the specified character encoding.
	 * <p>
	 * Character encoding names can be found at
	 * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
	 * <p>
	 * This method uses {@link String#String(byte[], String)}.
	 * 
	 * @param data  the byte array to write, do not modify during output,
	 * null ignored
	 * @param output  the <code>Writer</code> to write to
	 * @param encoding  the encoding to use, null means platform default
	 * @throws NullPointerException if output is null
	 * @throws IOException if an I/O error occurs
	 * @since Commons IO 1.1
	 */
	public static void write(byte[] data, Writer output, String encoding) throws IOException {
		if (data != null) {
			if (encoding == null) {
				write(data, output);
			} else {
				output.write(new String(data, encoding));
			}
		}
	}

    public static byte[] copyBuffer(byte[] buf, int offset, int length) {
        byte[] offerBuf = new byte[length];
        System.arraycopy(buf, offset, offerBuf, 0, length);
        return offerBuf;
    }

    public static char[] copyBuffer(char[] buf, int offset, int length) {
        char[] offerBuf = new char[length];
        System.arraycopy(buf, offset, offerBuf, 0, length);
        return offerBuf;
    }
}
